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Blockchain Tutorial - GeeksforGeeks

It is a secure, decentralized digital ledger that records transactions in blocks linked together as a chain. Each block stores verified transaction data, and once added, it cannot be changed or deleted, making the system trustworthy and tamper-proof.

Source: www.geeksforgeeks.org

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Blockchains are typically managed by a peer-to-peer (P2P) computer network for use as a public distributed ledger, where nodes collectively adhere to a consensus algorithm protocol to add and validate new transaction blocks.

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What is blockchain? - IBM

Blockchain is a shared, immutable digital ledger, enabling the recording of transactions and the tracking of assets within a business network and providing a single source of truth.